Cisco 1601 Hardware Installation Guide - Page 82

ISDN BRI U WAN Interface Cards ISDN BRI WAN Interface Cards The jumpers are factory-configured in the B position. Keep the jumpers in this position to use the ISDN BRI WIC in a point-to-point connection or as the last device on the line of a passive-bus connection. Set the termination jumpers to the A position to use the ISDN BRI WIC in a passive-bus connection in which it is not the last device on the line. The jumpers are shown in Figure 52. Figure 52 Jumper Locations on the Older ISDN BRI WIC A J1 J2 No termination B J1 J1 J2 J2 Termination jumpers 100 Ohms termination Connecting an ISDN BRI U WIC to a Network H8586 Warning Hazardous network voltages are present in WAN ports regardless of whether power to the unit is OFF or ON. To avoid electric shock, use caution when working near WAN ports. When detaching cables, detach the end away from the unit first. Statement 1026 Warning The ISDN connection is regarded as a source of voltage that should be inaccessible to user contact. Do not attempt to tamper with or open any public telephone operator (PTO)-provided equipment or connection hardware. Any hardwired connection (other than by a nonremovable, connect-one-time-only plug) must be made only by PTO staff or suitably trained engineers. Statement 23 OL-12844-01 8